i386: Eliminate sign extension after logic operation [PR89954]
Commit Message
Convert (sign_extend:WIDE (any_logic:NARROW (memory, immediate)))
to (any_logic:WIDE (sign_extend (memory)), (sign_extend (immediate))).
This eliminates sign extension after logic operation.
2021-09-30 Uroš Bizjak <ubizjak@gmail.com>
gcc/
PR target/89954
* config/i386/i386.md
(sign_extend:WIDE (any_logic:NARROW (memory, immediate)) splitters):
New splitters.
gcc/testsuite/
PR target/89954
* gcc.target/i386/pr89954.c: New test.
Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.
Pushed to master.
Uros.
@@ -10210,6 +10210,40 @@
[(set_attr "type" "alu")
(set_attr "mode" "<MODE>")])
+;; convert (sign_extend:WIDE (any_logic:NARROW (memory, immediate)))
+;; to (any_logic:WIDE (sign_extend (memory)), (sign_extend (immediate))).
+;; This eliminates sign extension after logic operation.
+
+(define_split
+ [(set (match_operand:SWI248 0 "register_operand")
+ (sign_extend:SWI248
+ (any_logic:QI (match_operand:QI 1 "memory_operand")
+ (match_operand:QI 2 "const_int_operand"))))]
+ ""
+ [(set (match_dup 3) (sign_extend:SWI248 (match_dup 1)))
+ (set (match_dup 0) (any_logic:SWI248 (match_dup 3) (match_dup 2)))]
+ "operands[3] = gen_reg_rtx (<MODE>mode);")
+
+(define_split
+ [(set (match_operand:SWI48 0 "register_operand")
+ (sign_extend:SWI48
+ (any_logic:HI (match_operand:HI 1 "memory_operand")
+ (match_operand:HI 2 "const_int_operand"))))]
+ ""
+ [(set (match_dup 3) (sign_extend:SWI48 (match_dup 1)))
+ (set (match_dup 0) (any_logic:SWI48 (match_dup 3) (match_dup 2)))]
+ "operands[3] = gen_reg_rtx (<MODE>mode);")
+
+(define_split
+ [(set (match_operand:DI 0 "register_operand")
+ (sign_extend:DI
+ (any_logic:SI (match_operand:SI 1 "memory_operand")
+ (match_operand:SI 2 "const_int_operand"))))]
+ "TARGET_64BIT"
+ [(set (match_dup 3) (sign_extend:DI (match_dup 1)))
+ (set (match_dup 0) (any_logic:DI (match_dup 3) (match_dup 2)))]
+ "operands[3] = gen_reg_rtx (DImode);")
+
(define_insn "*<code><mode>_2"
[(set (reg FLAGS_REG)
(compare (any_or:SWI
new file mode 100644
@@ -0,0 +1,45 @@
+/* PR target/89954 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+signed char ab;
+
+short aw;
+
+int al;
+
+short sext_andbw (void) { return ab & -2; }
+short sext_orbw (void) { return ab | -3; }
+short sext_xorbw (void) { return ab ^ -4; }
+
+int sext_andbl (void) { return ab & -2; }
+int sext_orbl (void) { return ab | -3; }
+int sext_xorbl (void) { return ab ^ -4; }
+
+int sext_andwl (void) { return aw & -2; }
+int sext_orwl (void) { return aw | -3; }
+int sext_xorwl (void) { return aw ^ -4; }
+
+#ifdef __x86_64__
+
+long long sext_andbq (void) { return ab & -2; }
+long long sext_orbq (void) { return ab | -3; }
+long long sext_xorbq (void) { return ab ^ -4; }
+
+long long sext_andwq (void) { return aw & -2; }
+long long sext_orwq (void) { return aw | -3; }
+long long sext_xorwq (void) { return aw ^ -4; }
+
+long long sext_andlq (void) { return al & -2; }
+long long sext_orlq (void) { return al | -3; }
+long long sext_xorlq (void) { return al ^ -4; }
+
+#endif
+
+/* { dg-final { scan-assembler-times "movsbw" 3 } } */
+/* { dg-final { scan-assembler-times "movsbl" 3 } } */
+/* { dg-final { scan-assembler-times "movswl" 3 } } */
+
+/* { dg-final { scan-assembler-times "movsbq" 3 { target { ! ia32 } } } } */
+/* { dg-final { scan-assembler-times "movswq" 3 { target { ! ia32 } } } } */
+/* { dg-final { scan-assembler-times "movslq" 3 { target { ! ia32 } } } } */